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<! This document generated using mif2html Version 1.0 - Walt Akers - 1996 !>
<head>
<title>CDEV Documentation</title>
</head>
<body bgcolor="#E0E0FF">
<body>
<! ************************ FILE : cdevGatewayTITLE.mif *****************************!>
<br><hr><br>
<table width=100%>
<tr><td>
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<!*** Start ADDRESS-TITLE ***!><font size=+12 color=Black><strong><em>
CDEV Gateway
<!*** Finish ADDRESS-TITLE ***!></p></strong></em></font>
<!*** Start ADDRESS-VERSION ***!><font size=+1 color=Black>
</p>
A Message Router/Concentrator for CDEV Clients
</p>
</p>
Walt Akers, Chip Watson, Jie Chen
</p>
</p>
Version 1.0 - February 13, 1997
</p>
</p>
TJNAF - Thomas Jefferson National Accelerator Facility
</p>
<!*** Finish ADDRESS-VERSION ***!></p></font>
</td></tr>
</table>
<! *************************** TABLE OF CONTENTS ****************************!>
<br><hr><br>
<table width=100%>
<tr><td>
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Table of Contents
<!*** Finish CLASS-TOC-TITLE ***!></p></strong></font>
</td></tr>
<tr><td>
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</td>
<td valign=top>
<table>
<tr><td valign=top align=right>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
1.
<!*** Finish HEADING1TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF1">CDEV Gateway Fundamentals</a>
<!*** Finish HEADING1TOC ***!><br></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<!*** Finish UHEADING2TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF2">Overview of the CDEV Gateway</a>
<!*** Finish UHEADING2TOC ***!><br></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<!*** Finish UHEADING2TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF3">Purpose of the CDEV Gateway</a>
<!*** Finish UHEADING2TOC ***!><br></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<!*** Finish UHEADING2TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF4">Features of the CDEV Gateway Service</a>
<!*** Finish UHEADING2TOC ***!><br></font>
</td></tr>
<tr><td valign=top align=right>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
2.
<!*** Finish HEADING1TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF5">Building the CDEV Gateway Service</a>
<!*** Finish HEADING1TOC ***!><br></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<!*** Finish UHEADING2TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF6">Location of Files</a>
<!*** Finish UHEADING2TOC ***!><br></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<!*** Finish UHEADING2TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF7">Steps to Building the Server and Service</a>
<!*** Finish UHEADING2TOC ***!><br></font>
</td></tr>
<tr><td valign=top align=right>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
3.
<!*** Finish HEADING1TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF8">Starting the CDEV Gateway</a>
<!*** Finish HEADING1TOC ***!><br></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<!*** Finish UHEADING2TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF9">Starting the Gateway Server</a>
<!*** Finish UHEADING2TOC ***!><br></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<!*** Finish UHEADING2TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF10">Start-up Arguments for the Gateway Server</a>
<!*** Finish UHEADING2TOC ***!><br></font>
</td></tr>
<tr><td valign=top align=right>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
4.
<!*** Finish HEADING1TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF11">Troubleshooting Server Start-up</a>
<!*** Finish HEADING1TOC ***!><br></font>
</td></tr>
<tr><td valign=top align=right>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
5.
<!*** Finish HEADING1TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start HEADING1TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF12">DDL Entries for the CDEV Gateway Client</a>
<!*** Finish HEADING1TOC ***!><br></font>
</td></tr>
<tr><td valign=top>
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<!*** Finish UHEADING2TOC ***!><br></font>
</td>
<td valign=top>
<!*** Start UHEADING2TOC ***!><font size=+1 color=Black>
<a href="cdevGateway.html#TOCREF13">Setting Up the DDL </a>
<!*** Finish UHEADING2TOC ***!><br></font>
</td></tr>
</table>
</td></tr>
</table>
<! **************************** LIST OF FIGURES *****************************!>
<br><hr><br>
<table width=100%>
<tr><td>
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<!*** Start CLASS-LOF-TITLE ***!><font size=+3><strong>
List of Figures
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</td></tr>
<tr><td>
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</td>
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<!*** Start FIGURELOF ***!><font size=+1 color=Black>
Figure 1:
<a href="cdevGateway.html#LOFREF1">Simple DDL file for the Gateway Service</a>
<!*** Finish FIGURELOF ***!><br></font>
</td></tr>
</table>
<! ************************ FILE : ./cdevGateway.mif *****************************!>
<br><hr><br>
<table width=100%>
<tr><td valign=top align=right>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
1.
<!*** Finish HEADING1 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
<a name="TOCREF1">
CDEV Gateway Fundamentals
</a> <!*** Finish HEADING1 ***!></p></strong></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2 ***!><font size=+1 color=Black><strong>
<a name="TOCREF2">
Overview of the
CDEV Gateway
</a> <!*** Finish UHEADING2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start BODY ***!><font size=+1 color=Black>
The CDEV Gateway is a server that acts as an intermediary between a CDEV
application and remote services. A single network connection is established between
the client and the gateway through which all CDEV requests will be routed. When the
gateway receives a request from the client, it establishes the appropriate connection
to the actual service, makes the request, and returns the result to the client
application.
<!*** Finish BODY ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2 ***!><font size=+1 color=Black><strong>
<a name="TOCREF3">
Purpose of the
CDEV Gateway
</a> <!*** Finish UHEADING2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start BODY ***!><font size=+1 color=Black>
The CDEV Gateway was designed to support the JAVA/CDEV API. Because JAVA
code must be small in order to load and execute efficiently, it was critical to move as
much code as possible out of JAVA and into a CDEV &quot;proxy&quot; which could perform
connection management and dynamic library loading. This allows the JAVA
application to access new services provided in C++ without adding any new code.
</p>
The JAVA/CDEV library locates the CDEV Gateway by using a hostname and port that
is provided in an environment variable. After determining the location of the server,
JAVA will establish a connection to the gateway and then begin transmitting its CDEV
requests in standard CLIP (CDEV Linear Internet Protocol).
</p>
The gateway can also be used by standard C or C++ CDEV applications to perform
message routing. This approach can lessen the number of connections to actual
control system devices and reduce network traffic significantly. The gateway is located
by the gateway service by looking up its name (as specified in the CDEV DDL) in the
global name server (The current name server is distributed as part of the CDEV
Generic Server in the CDEV distribution).
<!*** Finish BODY ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2 ***!><font size=+1 color=Black><strong>
<a name="TOCREF4">
Features of the
CDEV Gateway
Service
</a> <!*** Finish UHEADING2 ***!></p></strong></font>
</td>
<td valign=top>
<table>
<tr><td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
<img src="bullet.jpg">
<!*** Finish BULLETED ***!></p></font>
</td>
<td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
The CDEV Gateway is constructed using the CDEV Generic Server Engine and
the CLIP Protocol.
<!*** Finish BULLETED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
<img src="bullet.jpg">
<!*** Finish BULLETED ***!></p></font>
</td>
<td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
Each gateway server registers its name, host and port with the CDEV Name
Server when it is started.
<!*** Finish BULLETED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
<img src="bullet.jpg">
<!*** Finish BULLETED ***!></p></font>
</td>
<td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
The name of the specific gateway to be used is associated with a CDEV device/
message combination by using the &quot;server&quot; field of the service data in the CDEV
DDL file. Syntax is described later in this document.
<!*** Finish BULLETED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
<img src="bullet.jpg">
<!*** Finish BULLETED ***!></p></font>
</td>
<td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
The gateway service will establish one connection to a named gateway to perform
all transactions.
<!*** Finish BULLETED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
<img src="bullet.jpg">
<!*** Finish BULLETED ***!></p></font>
</td>
<td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
The client application uses a special DDL file that redirects all signals to the
gateway service. This allows the gateway server to maintain the actual control
system connections from a centralized location.
<!*** Finish BULLETED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
<img src="bullet.jpg">
<!*** Finish BULLETED ***!></p></font>
</td>
<td valign=top>
<!*** Start BULLETED ***!><font size=+1 color=Black>
The gateway server may have a standard DDL that redirects requests to the
actual service OR it may have a special DDL that routes requests to another
gateway. The system has currently been tested by routing messages through as
many as ten gateways before reaching the actual control system. Note that
performance begins to degrade substantially after routing through five gateways -
but is still reasonable.
<!*** Finish BULLETED ***!></p></font>
</td></tr>
</table>
</td></tr>
<tr><td valign=top align=right>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
2.
<!*** Finish HEADING1 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
<a name="TOCREF5">
Building the CDEV Gateway Service
</a> <!*** Finish HEADING1 ***!></p></strong></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2 ***!><font size=+1 color=Black><strong>
<a name="TOCREF6">
Location of Files
</a> <!*** Finish UHEADING2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start BODY ***!><font size=+1 color=Black>
The source code for the Gateway Service is provided with the CDEV distribution
starting with version 1.5. The source code is located in the directory $CDEV/
applications/cdevGateway. The following steps should be taken to build the Gateway
Server and Service.
<!*** Finish BODY ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2 ***!><font size=+1 color=Black><strong>
<a name="TOCREF7">
Steps to Building
the Server and
Service
</a> <!*** Finish UHEADING2 ***!></p></strong></font>
</td>
<td valign=top>
<table>
<tr><td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
1.
<!*** Finish NUMBERED ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
Obtain and install the CDEV distribution - Version 1.5 or higher.
<!*** Finish NUMBERED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
2.
<!*** Finish NUMBERED ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
Follow the installation steps to build CDEV on your system. This includes setting
all of the environment variables required by CDEV.
<!*** Finish NUMBERED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
3.
<!*** Finish NUMBERED ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
Follow the installation steps to build the CDEV Generic Server and deploy the
CDEV Name Server.
<!*** Finish NUMBERED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
4.
<!*** Finish NUMBERED ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
There is a collection of platform specific makefiles in the directory <em>$CDEV/
extensions/cdevGenericServer/include/makeinclude</em>. Link the makefile that is
appropriate to your architecture to the file Makefile.OS in THAT directory.
<!*** Finish NUMBERED ***!></p></font>
<!*** Start INDENTED ***!><font size=+1 color=Black>
For example, to link to the makefile for HP-UX, you would type the following
command.
</p>
</p>
<em>cd $CDEV/extensions/cdevGenericServer/makeinclude</em>
</p>
<em>ln -s Makefile.hpux Makefile.OS</em>
</p>
<!*** Finish INDENTED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
5.
<!*** Finish NUMBERED ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
Change directories to <em>$CDEV/applications/cdevGateway</em>.
<!*** Finish NUMBERED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
6.
<!*** Finish NUMBERED ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
Type make to compile and link the CDEV Gateway Service shared object and the
CDEV Gateway Server. Note that you must be using GNU make in order to build
this distribution.
<!*** Finish NUMBERED ***!></p></font>
</td></tr>
</table>
<!*** Start BODY ***!><font size=+1 color=Black>
Upon completion the Makefile will generate the shared object for the gateway service
and will install it into your CDEVSHOBJ directory. The gateway server will be
compiled, linked and installed in the directory $CDEV/applications/cdevGateway/bin/
ARCH/cdevGateway. At this point you are ready to start the gateway server.
<!*** Finish BODY ***!></p></font>
</td></tr>
<tr><td valign=top align=right>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
3.
<!*** Finish HEADING1 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
<a name="TOCREF8">
Starting the CDEV Gateway
</a> <!*** Finish HEADING1 ***!></p></strong></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2 ***!><font size=+1 color=Black><strong>
<a name="TOCREF9">
Starting the
Gateway Server
</a> <!*** Finish UHEADING2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start BODY ***!><font size=+1 color=Black>
The following steps should be taken to execute the cdevGateway.
<!*** Finish BODY ***!></p></font>
<table>
<tr><td valign=top>
<!*** Start NUMBERED1 ***!><font size=+1 color=Black>
1.
<!*** Finish NUMBERED1 ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED1 ***!><font size=+1 color=Black>
Ensure that the required CDEV and CDEV Generic Server environment variables
have been set. These include:
<!*** Finish NUMBERED1 ***!></p></font>
<table>
<tr><td valign=top>
<!*** Start FUNC_NAME_2 ***!><font size=+1 color=Black><strong>
CDEVDDL
<!*** Finish FUNC_NAME_2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF_2 ***!><font size=+1 color=Black>
This is the name of the DDL file that indicates where
messages should be routed. Typically, this DDL will
route the messages to the actual control system
devices.
<!*** Finish FUNC_DEF_2 ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME_2 ***!><font size=+1 color=Black><strong>
CDEVSHOBJ
<!*** Finish FUNC_NAME_2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF_2 ***!><font size=+1 color=Black>
This is the location of the CDEV shared object files.
<!*** Finish FUNC_DEF_2 ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME_2 ***!><font size=+1 color=Black><strong>
CDEV_NAME_SERVER
<!*** Finish FUNC_NAME_2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF_2 ***!><font size=+1 color=Black>
This is the host where the CDEV Name Server is
running.
<!*** Finish FUNC_DEF_2 ***!></p></font>
</td></tr>
</table>
</td></tr>
<tr><td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
2.
<!*** Finish NUMBERED ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
Move to the directory where the CDEV Gateway Server binary is located: by
default $CDEV/applications/cdevGateway/bin/ARCH, where ARCH is the name of
the host architecture.
<!*** Finish NUMBERED ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
3.
<!*** Finish NUMBERED ***!></p></font>
</td>
<td valign=top>
<!*** Start NUMBERED ***!><font size=+1 color=Black>
Type the command ./cdevGateway at the command line. This will start a gateway
server with the name <strong><em>Gateway1</strong></em><em> </em>on the current host using TCP/IP port 9573. This
information can be confirmed by using the <strong><em>dumpServer</strong></em> command that is
provided with the CDEV Generic Server Engine to display the contents of the
CDEV Name Server.
<!*** Finish NUMBERED ***!></p></font>
</td></tr>
</table>
<!*** Start BODY ***!><font size=+1 color=Black>
At this point the cdevGateway should be ready for use by client applications.
<!*** Finish BODY ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2 ***!><font size=+1 color=Black><strong>
<a name="TOCREF10">
Start-up
Arguments for the
Gateway Server
</a> <!*** Finish UHEADING2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start BODY ***!><font size=+1 color=Black>
The user can specify the name of port used by the CDEV Gateway from the command
line when the server is started. The gateway server will accept the following
parameters from start-up.
<!*** Finish BODY ***!></p></font>
<table>
<tr><td valign=top>
<!*** Start FUNC_NAME_2 ***!><font size=+1 color=Black><strong>
s=<em>server name</em>
<!*** Finish FUNC_NAME_2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF_2 ***!><font size=+1 color=Black>
This allows the caller to specify the server name that
will be registered with the name server. By default
the server name is <strong><em>Gateway1</strong></em>.
<!*** Finish FUNC_DEF_2 ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME_2 ***!><font size=+1 color=Black><strong>
p=<em>port number</em>
<!*** Finish FUNC_NAME_2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF_2 ***!><font size=+1 color=Black>
This allows the caller to specify the port that the
server will use to receive incoming requests. By
default the port used by the server is <strong><em>9573</strong></em>.
<!*** Finish FUNC_DEF_2 ***!></p></font>
</td></tr>
</table>
</td></tr>
<tr><td valign=top align=right>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
4.
<!*** Finish HEADING1 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
<a name="TOCREF11">
Troubleshooting Server Start-up
</a> <!*** Finish HEADING1 ***!></p></strong></font>
<!*** Start BODY ***!><font size=+1 color=Black>
When the server is started it may display one or more error conditions that will prevent
it from operating properly.
<!*** Finish BODY ***!></p></font>
<table>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Error:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_PROTO ***!><font size=+1 color=Black><em>
syntax error at line:#
<!*** Finish FUNC_PROTO ***!></p></em></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Meaning:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF ***!><font size=+1 color=Black>
This message indicates that the CDEVDDL file that is being
used by the gateway is formatted improperly.
<!*** Finish FUNC_DEF ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Solution:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF ***!><font size=+1 color=Black>
Edit the CDEVDDL file and correct any formatting errors that
may exist.
<!*** Finish FUNC_DEF ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Error:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_PROTO ***!><font size=+1 color=Black><em>
ERROR: Gateway1 server already exists in GATEWAY domain
<!*** Finish FUNC_PROTO ***!></p></em></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Meaning:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF ***!><font size=+1 color=Black>
This message indicates that a gateway server with the name
Gateway1 has already been started and is currently registered
with the CDEV Name Server.
<!*** Finish FUNC_DEF ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Solution:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF ***!><font size=+1 color=Black>
The gateway will continue to attempt to register itself with the
name server every 30 seconds. If the message continues to
appear, then restart the gateway using the s parameter to
specify a different server name OR shutdown the other
gateway that is using the same name.
<!*** Finish FUNC_DEF ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Error:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_PROTO ***!><font size=+1 color=Black><em>
Could not communicate with name server
</p>
ERROR: Failed to execute &quot;REGISTER SERVER&quot; operation
<!*** Finish FUNC_PROTO ***!></p></em></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Meaning:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF ***!><font size=+1 color=Black>
This message indicates that the CDEV Name Server could not
be accessed either because it is not running or because the
CDEV_NAME_SERVER environment variable does not specify
the correct host.
<!*** Finish FUNC_DEF ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Solution:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF ***!><font size=+1 color=Black>
Ensure that the CDEV_NAME_SERVER environment variable
is set and indicates the host where the name server is running.
If this is correct, check to ensure that the name server is
actually running on the specified host.
<!*** Finish FUNC_DEF ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Error:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_PROTO ***!><font size=+1 color=Black><em>
Error: Server Gateway1 - Unable to open listening socket
<!*** Finish FUNC_PROTO ***!></p></em></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Meaning:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF ***!><font size=+1 color=Black>
This message indicates that the port that the name server is
attempting to use to listen for new connections is already in
use.
<!*** Finish FUNC_DEF ***!></p></font>
</td></tr>
<tr><td valign=top>
<!*** Start FUNC_NAME ***!><font size=+1 color=Black><strong>
Solution:
<!*** Finish FUNC_NAME ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start FUNC_DEF ***!><font size=+1 color=Black>
Use the command line arguments to specify a different listening
port.
<!*** Finish FUNC_DEF ***!></p></font>
</td></tr>
</table>
<!*** Start BODY ***!><font size=+1 color=Black>
</p>
</p>
</p>
<!*** Finish BODY ***!></p></font>
</td></tr>
<tr><td valign=top align=right>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
5.
<!*** Finish HEADING1 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start HEADING1 ***!><font size=+3 color=Black><strong>
<a name="TOCREF12">
DDL Entries for the CDEV Gateway Client
</a> <!*** Finish HEADING1 ***!></p></strong></font>
</td></tr>
<tr><td valign=top>
<!*** Start UHEADING2 ***!><font size=+1 color=Black><strong>
<a name="TOCREF13">
Setting Up the
DDL
</a> <!*** Finish UHEADING2 ***!></p></strong></font>
</td>
<td valign=top>
<!*** Start BODY ***!><font size=+1 color=Black>
The following example illustrates how to add a service entry to identify the CDEV
Gateway Service and how to use the service data to specify the server that the
gateway service will use for routing messages.
</p>
<!*** Finish BODY ***!></p></font>
<!*** Start FIGURE ***!><font size=+0 color=Black><em>
Figure 1:
<a name="LOFREF1">
Simple DDL file for the Gateway Service
<table border=1><tr><td>
<table>
<tr><td>
<! ***** Empty Column ***** !>
</td>
<td valign=top>
<!*** Start PROGRAM ***!><pre><font size=+0 color=Black><strong><em>
/*
* This is the service definition, it tells CDEV that there is
* a service named Gateway and that it will use the cdevData
* tag 'server' to locate the gateway using the CDEV Name Server.
*/
service Gateway
{
tags {server}
}
/*
* This class definition identifies the class gatewayClass which
* supports the &quot;get&quot;,&quot;set&quot;, &quot;monitorOn&quot; and &quot;monitorOff&quot;
* commands on attributes &quot;attrib0&quot; and &quot;attrib1&quot;. Note that
* requests made to attrib0 will be routed through &quot;Gateway1&quot;
* and requests made to attrib1 will be routed through
* &quot;Gateway2&quot;.
*/
class gatewayClass
{
verbs {get, set, monitorOn, monitorOff}
attributes
{
attrib0 Gateway {server=Gateway1};
attrib1 Gateway {server=Gateway2};
}
}
/*
* Finally, the CDEV DDL identifies two devices that are of type
* gatewayClass. Any time one of the supported messages is passed
* to one of these devices it will be routed through a CDEV
* Gateway.
*/
gatewayClass : device0, device1;
<!*** Finish PROGRAM ***!></strong></em></font></pre>
</td></tr>
</table>
</tr></td></table>
<AFrame 1>
</a> <!*** Finish FIGURE ***!></p></em></font>
<!*** Start BODY ***!><font size=+1 color=Black>
<!*** Finish BODY ***!></p></font>
</td></tr>
</table>
</body>
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